Equilibrium - strong selective filter on the immune system, strong filter to mix it up with lots of children with slightly different immune systems to beat the parasites. On the other hand, can't beat the animals who you're unintentionally breeding to be wise to your tricks. 5/x
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That was another big step; cooperate enough with a wide enough group of men that you can produce wealth to produce weapons for armies that are equipped with increasingly sophisticated arms and armor. 16/x
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Without going into the more recent steps this process seems to have bred in the weakness that has allowed what is basically social cancer to grow - cancer in that individual cells are prospering while killing the host. 17/x
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Touching on one point from earlier though. The nodes that are connected via an edge from the second continent are subject to the same broad forces as the Eurasian continent but the process starts many 1000s of years later. Re-introduction has entirely predictable results. 18/x
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Counterfactual speculation - if the graph doesn't have more nodes away from the Eurasian node does the cancer spread? You could make a case that it doesn't - that the evolutionary arms race forces are too strong, constantly pushing to a new local maximum. 19/x
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So maybe the filter is: Life, etc. Need isolated continents Can't have isolated continents that branch off only edge of the origin continent Who knows what the probability of development like that is? Time to start studying exoplanet-plate tectonics 20/x
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